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fsck_online: wrap Linux getdents(2) to a function

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CismonX 2025-01-23 00:00:00 +08:00
parent c2bdd02c65
commit b699a613ef
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GPG key ID: 3094873E29A482FB
1 changed files with 18 additions and 5 deletions
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23
src/fsck_online.c
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@ -67,6 +67,10 @@ struct fsck_dir {
#define FSCK_DIR_DONE ( 1u << 0 ) #define FSCK_DIR_DONE ( 1u << 0 )
// Forward declaration start // Forward declaration start
#ifdef __linux__
static ssize_t getdents (int, void *, size_t);
#endif
static int next_subdir (struct fsck_ctx *, struct fsck_dir *, static int next_subdir (struct fsck_ctx *, struct fsck_dir *,
struct dirent const **); struct dirent const **);
static int open_subdir (int, char const *, uint64_t *); static int open_subdir (int, char const *, uint64_t *);
@ -75,22 +79,31 @@ static void print_help (void);
static void print_version (void); static void print_version (void);
// Forward declaration end // Forward declaration end
#ifdef __linux__
static ssize_t
getdents (
int dirfd,
void *buf,
size_t bufsize
) {
return syscall(SYS_getdents64, dirfd, buf, bufsize);
}
#endif /* defined(__linux__) */
static int static int
next_subdir ( next_subdir (
struct fsck_ctx *ctx, struct fsck_ctx *ctx,
struct fsck_dir *dir, struct fsck_dir *dir,
struct dirent const **dent_ptr struct dirent const **dent_ptr
) { ) {
#ifdef __linux__
# define getdents(...) syscall(SYS_getdents64, __VA_ARGS__)
#endif
#define DIRENT_BUFSIZE 4096
size_t start = dir->dent_start; size_t start = dir->dent_start;
size_t off = dir->dent_off; size_t off = dir->dent_off;
size_t len = ctx->dent_buf_used; size_t len = ctx->dent_buf_used;
while (1) { while (1) {
if (off == len) { if (off == len) {
#define DIRENT_BUFSIZE 4096
if (start + DIRENT_BUFSIZE > ctx->dent_buf_size) { if (start + DIRENT_BUFSIZE > ctx->dent_buf_size) {
ctx->dent_buf_size = start + DIRENT_BUFSIZE; ctx->dent_buf_size = start + DIRENT_BUFSIZE;
ctx->dent_buf = xrealloc(ctx->dent_buf, ctx->dent_buf_size); ctx->dent_buf = xrealloc(ctx->dent_buf, ctx->dent_buf_size);